18923497 has 2 divisors, whose sum is σ = 18923498. Its totient is φ = 18923496.

The previous prime is 18923477. The next prime is 18923501. The reversal of 18923497 is 79432981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18156121 + 767376 = 4261^2 + 876^2 .

It is an emirp because it is prime and its reverse (79432981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18923497 - 2¹¹ = 18921449 is a prime.

It is not a weakly prime, because it can be changed into another prime (18923407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9461748 + 9461749.

It is an arithmetic number, because the mean of its divisors is an integer number (9461749).

Almost surely, 2^18923497 is an apocalyptic number.

It is an amenable number.

18923497 is a deficient number, since it is larger than the sum of its proper divisors (1).

18923497 is an equidigital number, since it uses as much as digits as its factorization.

18923497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 18923497 is about 4350.1145961917. The cubic root of 18923497 is about 266.4815414775.

The spelling of 18923497 in words is "eighteen million, nine hundred twenty-three thousand, four hundred ninety-seven".